MATLAB pivottables函数，实现数据透视

% How the pivottables created are shown in following examples:
% let
% inMatrix = {
% ‘2009’, ‘Mon’, 12, 31;
% ‘2009’, ‘Wed’, 11, 34;
% ‘2009’, ‘Fri’, 1, 4;
% ‘2009’, ‘Mon’, 3, 4;
% ‘2009’, ‘Wed’, 9, 6;
% ‘2009’, ‘Fri’, 1, 4;
% ‘2010’, ‘Mon’, 18, 15;
% ‘2010’, ‘Wed’, 11, 21;
% ‘2010’, ‘Wed’, 1, 4;
% };
% then
% pivottable(inMatrix, 1, 2, 3, @sum) output a cell
% [] ‘Fri’ ‘Mon’ ‘Wed’
% ‘2009’ [ 2] [ 15] [ 20]
% ‘2010’ [] [ 18] [ 12]
% pivottable(inMatrix, [1 2], [], 3, @sum) output a cell
% ‘2009’ ‘Fri’ [ 2]
% ‘2009’ ‘Mon’ [15]
% ‘2009’ ‘Wed’ [20]
% ‘2010’ ‘Mon’ [18]
% ‘2010’ ‘Wed’ [12]
% pivottable(inMatrix, [], 2, 3, @sum) output a cell
% ‘Fri’ ‘Mon’ ‘Wed’
% [ 2] [ 33] [ 32]
% pivottable(inMatrix, 1, 2, [3 4], {@sum, @(x)(numel(x))})
% [] ‘Fri’ ‘Fri’ ‘Mon’ ‘Mon’ ‘Wed’ ‘Wed’
% ‘2009’ [ 2] [ 2] [ 15] [ 2] [ 20] [ 2]
% ‘2010’ [] [] [ 18] [ 1] [ 12] [ 2]
%
% author: zhang@zhiqiang.org, http://zhiqiang.org/blog/it/pivottable-in-matlab.html
% version: 2011-02-28 ver 1